[9.0] [ML] Improve log message for model snapshot update (#134541) #134904
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Since the 9.0 upgrade, we have introduced a solution by setting large .ml-anomalies to read only during the upgrade assistant. However, there is an edge case that will cause the obsolete model snapshot to fail to upgrade. Step to reproduce: setup a 7.17 cluster create and start an anomaly detection job upgrade to 8.18 or 8.19 go to upgrade assistant change .ml-anomalies-shared to read only then try upgrade obsolete model snapshot Observed: upgrade model snapshot will fail. This PR extends the warning message explaining the steps to resolve the issue. (cherry picked from commit c47522c) # Conflicts: # server/src/main/java/org/elasticsearch/common/ReferenceDocs.java # server/src/main/resources/org/elasticsearch/common/reference-docs-links.txt
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